{"id":"CVE-2026-89709","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nlockd, nfsd: RCU-protect nlmsvc_ops dispatch\n\nnlmsvc_ops is published by nfsd_lockd_init() and cleared by\nnfsd_lockd_shutdown() with plain stores, while lockd dereferen…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nlockd, nfsd: RCU-protect nlmsvc_ops dispatch\n\nnlmsvc_ops is published by nfsd_lockd_init() and cleared by\nnfsd_lockd_shutdown() with plain stores, while lockd dereferen…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-476","CWE-416"],"vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 836ce2b99bcce6d68c58edd04efbc5cd1fd581af","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3c461a1820088fb5889d73a6522369bde45527a9","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 641e5e20852359b8c31149be4598884e30652f60","Linux 2.6.12"],"published":"2026-09-11","updated":"2026-10-15","sourceUpdated":"2026-10-15T11:17:55.150","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89709","references":[{"url":"https://git.kernel.org/stable/c/3c461a1820088fb5889d73a6522369bde45527a9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/641e5e20852359b8c31149be4598884e30652f60","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/836ce2b99bcce6d68c58edd04efbc5cd1fd581af","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89709.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89709"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532208"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89709"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89709"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89709.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-89709"},{"url":"https://git.kernel.org/stable/c/43943532c105ea8fe26039a1347cfda4ac0fcadc"},{"url":"https://git.kernel.org/stable/c/6e7495972039f212e336e552b58cac9dd54611c3"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00552,"epssPercentile":0.45949,"scores":{"nvd":8.1,"cna":8.1,"vendor":5.9},"ingestedAt":"2026-09-14T15:23:07.472Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T19:26:23.054440Z"},"slug":"CVE-2026-89709","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nlockd, nfsd: RCU-protect nlmsvc_ops dispatch\n\nnlmsvc_ops is published by nfsd_lockd_init() and cleared by\nnfsd_lockd_shutdown() with plain stores, while lockd dereferences\nit unguarded from dispatch sites in fs/lockd/svcsubs.c. The pointer\ntargets nfsd's .rodata and the fopen/fclose callbacks live in nfsd's\n.text, so a stale load after rmmod nfsd results in either a NULL\nderef or a module-text use-after-free.\n\nDeclare nlmsvc_ops as __rcu, publish via rcu_assign_pointer(), clear\nvia RCU_INIT_POINTER() + synchronize_rcu(). Add a struct module\n*owner field to nlmsvc_binding and pin the module across indirect\ncalls with try_module_get/module_put. When the binding is torn down,\nfall back to fput() to avoid leaking struct file references.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89709.json)","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":222157,"id":"CVE-2026-89709","ts":1792062148845,"field":"cvss","old":"7","new":"8.1"},{"seq":208448,"id":"CVE-2026-89709","ts":1790005704964,"field":"cvss","old":"4.4","new":"7"},{"seq":208447,"id":"CVE-2026-89709","ts":1790005704964,"field":"severity","old":"medium","new":"high"},{"seq":202972,"id":"CVE-2026-89709","ts":1789403733171,"field":"cvss","old":"8.1","new":"4.4"},{"seq":202971,"id":"CVE-2026-89709","ts":1789403733171,"field":"severity","old":"high","new":"medium"},{"seq":197710,"id":"CVE-2026-89709","ts":1789384318503,"field":"cvss","old":"4.4","new":"8.1"},{"seq":197709,"id":"CVE-2026-89709","ts":1789384318503,"field":"severity","old":"medium","new":"high"},{"seq":183661,"id":"CVE-2026-89709","ts":1789356676827,"field":"cvss","old":"8.1","new":"4.4"},{"seq":183660,"id":"CVE-2026-89709","ts":1789356676827,"field":"severity","old":"high","new":"medium"},{"seq":153598,"id":"CVE-2026-89709","ts":1789285351436,"field":"cvss","old":null,"new":"8.1"},{"seq":153597,"id":"CVE-2026-89709","ts":1789285351436,"field":"severity","old":"none","new":"high"},{"seq":147604,"id":"CVE-2026-89709","ts":1789270211563,"field":"cvss","old":null,"new":"4.4"},{"seq":147603,"id":"CVE-2026-89709","ts":1789270211563,"field":"severity","old":"none","new":"medium"},{"seq":109352,"id":"CVE-2026-89709","ts":1789183731574,"field":"cvss","old":null,"new":"4.4"},{"seq":109351,"id":"CVE-2026-89709","ts":1789183731574,"field":"severity","old":"none","new":"medium"}]}